"Industrial Load Management System Using MQTT Protocol for Real-Time Energy Optimization, Thesis of Industrial management

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Characteristics © Opening size: 13mm*13mm. * Non-linearityt3% (10%—120% of rated input current). ¢ Im leading wire, standard 3.5 three core plug output. ¢ Current output type and voltage output type with built in sampling resistor. ¢ Core material: ferrite. * Mechanical strength: the number of switching is not less than 1000 times(test at 25°C). * Safety index: Dielectric strength(between shell and output)!1000V AC/Imin. e Fire resistance property: In accordance with UL94-Vo. ¢ Work temperature: -25°C~+70°C. The specifications of the current sensor is explained in the Table 3.1 which explains the turns ratio, output voltage and other details. Table 3.1 Description of CS Input current 0-100A Output voltage 0-50mV Non-linearity +3% Build-in sampling resistance(R1.) 622 Turn ratio 100A:0.05A Resistance grade Grade B _ a ~25°C~170°C Work temperature “Dielectric strength(between shell | 1000V AC/Imin Sma and output) 15 The number of secondary turns in the CT pictured above, is 2000, so the current in the secondary is one 2000th of the current in the primary.Normally, this ratio is written in terms of currents in Amps e.g. 100:5 (for a 5A meter, scaled 0 - 100A). The ratio for the CT above would normally be written as 100:0.05. Burden resistor A "current output" CT needs to be used with a burden resistor. The burden resistor completes or closes the CT secondary circuit. The burden value is chosen to provide a voltage proportional to the secondary current. The burden value needs to be low cnough to prevent CT core saturation. Safety In general, a CT must never be open-circuited once it's attached to a current- carrying conductor. A CT is potentially dangerous if open-circuited.If open-circuited with current flowing in the primary, the transformer secondary will attempt to continue driving current into what is effectively an infinite impedance. This will produce a high and potentially dangerous voltage across the secondary, Some CTshave built-in protection. Some have protective Zener diodes as is the case with the SCT-013-000 recommended for use in this project. If the CT is of the ‘voltage output’ type, it has a built in burden resistor. Thus, it cannot be open-circuited. Installing a CT CT is the wire carrying the current you want to The primary winding of the ¢ cablethat has wires carrying measure. If you clip your CT around a two or three cor the same current but in opposite directions, the magnetic fields created by the wires will cancel cach other, and your CT will have no output.A split-core CT. especially (such as the ones made by YHDC) should never be one that has a ferrite core the brittle nature of . er : e clamped" to the cable using any sort of packing material, because 16